Mobs' pathfinding breaks when on waterlogged top slabs

The bug

Entities have difficultly pathfinding when standing on waterlogged top slabs.

Similarly to MC-136318, the mobs will stop moving and spin when on top of a waterlogged block. In 1.14.4 Pre-Release 2, the pathfinding was fixed for most waterlogged blocks. However, the pathfinding is still bugged if the block is the top half of a waterlogged slab.

How to reproduce

1. Run the following command:

   /fill ~10 ~-1 ~10 ~-10 ~-1 ~-10 minecraft:cut_copper_slab[waterlogged=true,type=top]

2. Summon a cow on top of the cut copper slabs
3. Attack the cow

Observed behavior

The cow does not panic; it has difficulty pathfinding while on waterlogged top slabs.

Expected behavior

The cow would panic; Entities would not have difficultly pathfinding while on waterlogged top slabs.